Jyxo\Mail\Parser::getRelatedParts PHP Method

    public function getRelatedParts(string $pid, array $types, bool $all = false) : array
    {
        try {
            $this->checkIfParsed();
        } catch (\Jyxo\Mail\Parser\EmailNotExistException $e) {
            throw $e;
        }
        $related = [];
        if (!empty($this->structure['pid'])) {
            // Deals a problem with multipart/alternative and multipart/report, when they are as the first part and don't have any real Ids (they have a fake Id 0 assigned then)
            if ('0' === $pid) {
                for ($i = 1; $i < count($this->structure['pid']); $i++) {
                    // Subparts do not contain a dot because they are in the first level
                    if (false === strpos($this->structure['pid'][$i], '.') && ($all || in_array($this->structure['ftype'][$i], $types))) {
                        $related['pid'][] = $this->structure['pid'][$i];
                        $related['ftype'][] = $this->structure['ftype'][$i];
                    }
                }
            } else {
                $level = count(explode('.', $pid));
                foreach ($this->structure['pid'] as $i => $rpid) {
                    // Part is one level deeper and the first number equals to the parent
                    if (count(explode('.', $rpid)) == $level + 1 && $pid == substr($rpid, 0, strrpos($rpid, '.'))) {
                        if ($all || in_array($this->structure['ftype'][$i], $types)) {
                            $related['pid'][] = $this->structure['pid'][$i];
                            $related['ftype'][] = $this->structure['ftype'][$i];
                        }
                    }
                }
            }
        }
        return $related;
    }